Telephone system.



Patented Nov. 3, 1914.,

P. R. PARKER. TELEPHONE SYSTEM.

APPLICATION FILED JULY 13,1911.

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UNITED srarns PATENT orricn.

I rnnnnnrox a. 'rAnKEn, or BUFFALO, NEW YORK.

Specification of Letters Patent. 7

TELEPHONE SYSTEM.

Patented Nov. 3, 1914..

Original application filed November 24, 19cc, Seria1iNd. 344, 894. Divided and this application filed my 13, a 9.11. SeriaLHo..638;33-9. y

To all whom it may concern: p I i le it known that I, FREDERICK RJPARKER, a citizen of the United States of America,

residing at, Buffalo, in the county of Erie.

and State of New. York, have invented a new and useful Telephone System, ofwhichthe following is a specif cation, reference illustrating same.

being bad to the accompanying drawings,

My invention relates in general toelectrical systems for transmitting intelligence,

and will be hereinafter particularly de.- scribed as applied to a telephonesystem.

The principal objects of my invention are,

to provide improved line and supervisory signaling devices for electrical systems; to provide improvedarrangements of the line and supervisory signaling devices in such systems, and improved meansfor operating same; to. provide an improved signaling device adaptedfor use'as both aline signal and a supervisory signal, and improved means for utilizing such a signaling device; to provide an improved transfer circuit for extending or transferring the connections from one switchboard to another or from one position to another, and improved means for supervising such COIlIl6Ct1OIlS;'

and to provide other improvements hereinafter set fortln Other objects will: be apparent from the following specification.

In this present invention I employ a signal-initiating device in connection witheach of the lines of the electrical system, such as a telephone system, and operate such devices in series with their lines to. give predetermined signals, preferably line signals,

and in bridging circuits of their lines to,

give other predeterminedsignals, preferably supervisory signals, in the, latter case the said devices being shunted out or rendered inoperative by their lines when the circuits,

of the latter areclosed, and allowed to operate-to give signalswhen the sald line shunts are. removed. Thus it will be seen that the circuits of the signal-initiating devices are changed (from series circuits of the lines to bridging circuits of the lines, or

ice versa, for giving the. different signals.

In the accompanying drawings illustrating one form of my invention, Figure 1 isa' diagram, showing two subscribers telephone lines extending from respective sub-.

stations to: a central station, and the central 1 station apparatus therefor; 'and Fig. 2 is with the line; 1

crators transmitter 36 and receiver from onep'osition to another.

Like characters refer tolike parts in-the several figures.

Inthe drawings, substation A iscon nected with the central station by a suitable line circuit comprising limbs 1 and 2 which. preferably terminate in contact springs 3 and it, respectively, of a springjack G. A- signali-ng device D from limb 1 of the is normally connected line through contacts 6 and 5 of ack C, toone pole 7 of the sourceofelectricity E, the connection to v V i limb 1 being preferably permanently made.

The other pole S of battery E is preferably connected through contact 9 and jack spring 4 to lnnb2 of the'line. normallyplace thesignaling device D and These connections source of electricity E in a series circuit Atthe substation, A various forms of ap paratus may-be employed, as well understood, the apparatusillustrated being adapted: to close the circuit of the line when the receiveris removed from the switch-hook, and. to open the circuit of the line when the receiver is hung upon the switch hook. The

apparatus of line B is the same as that of line-A, and like charactersflhave been em,-

ployed to represent like part.

In the plug-cord connecting circuit of Fig. 1 the connecting plugs H and I are normally connected together through repeating coil K as shown. -The central SOHl'CGOf electricity E is bridged across the ,lnainifstrands of the plug-cord circuit betweenwindings 32 and 33" and windings 34: and 35 of the'repe ating coil K. The 0p- 37 may be bridged across. the plug-cord circuit by springs 40 and an of the listening key engaging contacts 38 and 39,"respectivcly,

when depressed: The ringing key G is constructed and connected: to disconnectgthe main. strands 29 and 31 ofconnecting plug Ifrom the repeating coil K, and to reverse the poles of battery E on the'strands 29 and 31 when depressed, springs 21 and 22 disengaging contacts 23 and 2/1, respectively, which are connected to poles 7 and 8, respectively, of battery, E, and engaging contacts 25 and 26, respectively, which are connected to poles 8 and 7, respectively, of bat:

No. 1,000,340, of which this present application is a division.

In Fig. 2 l. have shown a transfer circuit adapted to be used with the system of Fig.

1, for transferring the calls or connections from one switchboard to another, or between different sections or positions of the same switchboard. The jack C is provided with tip and sleeve contact springs 48 and 49, respectively, which are connected to limbs 50 and 51, respectively, of the transfer circuit, which limbs terminate in tip and sleeve strands 52 and 53, respectively, of transfer plug J. A transfer signaling device M is connected from tip spring 48 of jackC,, through a plug-seat switch 55 54 at plug J, to limb 51' of the transfer. circuit. Jack C, and plug I are at one operators position, and plug J and ringing key N are at another operators position, or at another switchboard. Ringing key N is adapted to reverse the poles of battery E on the main strands 52 and 53 of transfer plug-J when depressed,*the same as key G reverses the poles of battery E on strands 29 and 31 of plug 1, springs 56 and 5'7 disengaging contacts 58 and 59, respectively, and engaging contacts 60 and 61, respectively.

The operation of the system is as follows: If subscriber A desires to talk with subscriber B, he lifts his telephone receiver from the switch hook, in the usual manner, and thereby closes a circuit of battery E from pole 7 through contacts 5 and 6', signaling device D of line A, limb 1 of the line, substation A, limb 2 of the line, jack spring 4, and contact 9 to pole 8 of battery E, which causes current to flow over this circuit sufliciently to actuate the signaling device D and cause same to give a signal for connection. In answer to the line signal of signaling devices D, the operator inserts answering plug H into jack 0 of line A, thereby disengaging jack spring 4 from contact 9, and engaging the spring 4 with contact 6 which is thereby disengaged from contact 5. Now the circuit of battery E is closed through winding 32 of repeating coil K, tip strand 2S, jack spring 3, limb 1 of the line, substation A, limb 2 of the line, jack spring 4, sleeve strand 30, and winding 34 of repeating coil K, the signaling device D being now bridged across this circuit from jack spring 3 through the device D and contact 6 to jack spring 4, and shunted by the relatively low resistance of the line so as to render it incapable of displaying a signal. The operator now depresses her listening key which connects her telephone set across the main strands .of answering plug H in the usual manner, for conversation with subscriber A. l/Vhe'n the operator learns from subscriber A that he wishes connection with subscriber B, she inserts the calling plug 1 into jack 0 of line B and thereby closes a circuit of battery E from pole 7, through winding 33 of repeating coil K, tip strand 29, jack spring 8 of line B, signaling device D of line B, contact 6, jack spring 4, sleeve strand 31, and winding 35 of repeating coil K, to pole 8 of battery E. The current now flowing through this circuit energizes the signaling'device D and causes same to display "a signal, the line circuit being now open at substation B and therefore not shunting the device D to render it inoperative. lVhen plug I is inserted into jack 0 ofline B, it switches the circuits the same as "described above in connection with plug H and jack C of line A,thus changing the circuit of signaling device D from a series cir- 'cuito'f the line to a bridging circuit of the line. The operator now depresses her ringing key G, and thereby reverses the poles of battery E on the line of subscriber B, as above stated, to ring the ringer F at substation B as a calling signal for the sub scriber at substation B, as described in detail in my above mentioned United States Patent No. 1,000,340.v As the operator depresses ringing key G she preferably restores her listening key to normal position, in the usual manner. When the subscriber at substantion B is rung sufliciently, the operator restores her ringing key Gr to normal position. \Vhen the subscriber at substation B responds to his call and takes his receiver from the switch-hook, he closes the circuit of battery E over his line and there by connects the line as a shunt around the signaling device D which is now bridged across the line as above described, to shunt the device D and thereby extinguish itssignal. Now the subscribers A and B are connected for conversation with each other, both of the signals D D for the respective lines being inactive. When the conversa tion is completed and subscriber A hangs his receiver upon its switch-hook, he breaks the circuit of his line at his'substation and thereby takes the line shunt away from his signaling device D and thus allows the latter to operate, by means of current from battery E over thecircuit 32, 28, 3, D, 6, 4,

well understood. When the operator receives both disconnect signals, from subscribers A. and B respectively, she withdraws the plugs H and Ifrom'their respective spring jacks and thereby extinguishesthe supervisory" or disconnect signals D-D and restores all circuits and apparatus to their normal condition. If subscriber A has called for subscriber B and the latteris on another switchboard, or his jack is; outof reach of the A-line operator, then. it is necessary to use the transfer circuit of Fig. 2

for making the'connection In this case the A-line operator-inserts the; callingpplug ;I into the transfer l hen the A -line. operator. 1 instructs the B-line operator, in any suitable manner, toqinsert the transfer plug J into jack O of line B. WVheii plug 1. is inserted into jack C a circuit is closed from pole .7 ofbattery E throughwinding: 33, tip strand 29, jack spring 48, signaling device M at the A-line position, plug-seat switch contacts 55 at the B-line position, conductor] 5i, jack spring49, sleeve strand 31, and winding 35'to pole 8 of battery E, which causes signaling device M: to operate,by means of current from battery E, and thereby display a signal. When the B-line operator inserts key N and thereby rings the ringer F at substation B as hereinbefore mentioned.

When subscriber B is rung isuiliciently, the ringing key N is restored to its normal position. l/Vhen subscriber B responds to his call and lifts his receiver from the switchhook, he closes the circuit of his lineas a relatively low-resistance shunt around his signaling device Dand therebydeenergizes D and'extinguishes its signal which indi cates to the B-line' operator that subscriber B has answered his call. The talking circuit between subscribers A and B now includes line A, the cord circuit of Fig.1, the main strands 50 and51 ofthe transfer circuit of F ig. 2, and line B. W liQnthe conversation is completed and subscriber B hangs his receiver upon its switclLhook, he

breaks the circuit of his line at his substation and thereby takes the line shunt away from his signaling device D which now opcrates, due to theremoval of the line shunt,

sleeve strand 53, conductor tion.

jack C, which extends the cord circuit to transfer plug J at the B-lin'e' position.

3 which device M and exg with an impedance, signal, or other :able devices. a suitable direct-current generator if desired.

limited to the exact details nor 'ticular apparatus or arrangements herein shown, as many modifications thereof may be madelor the scope of the appended claims.

connection.

by means of current from battery E over the circuitfrom pole 7, through winding 33,

tip strand 29, jack spring 48, conductor'ci), tip. strand 52, jack spring 3 of line B, signaling deviceD, contact-6,-jack spring 4-,

d9, sleeve strand 81, and winding 35:to pole S of battery E, and thereby conveys to the B-line operator, the signal for disconnec- The B-line operator now withdraws plug: J from 51, ack spring jackC of lineB and thereby opens the circuit of battery E through sig- I naling device D and extinguishes its signal, at the sanie timercstoring the circuits of line Bto their normal condition. When the plug J is returned to its plug seat, it closes the contacts 54: 55 and thereby closes the circuit 'of battery E through signaling device M, over the path hereinbefore described, M thereupon displays a sigi'ial to indicate tothe A-line operator that the plug J has been removed from its jack.

When the A-line operator receives this sig- :nal she withdrawsthe plug I from the jack C and therebydisconnects battery E from signaling device M and extinguishes its plug H from his jackC and thereby restores all. A-line circuits and apparatus to their 'normal condition.

If-desired, the transfer circuit may be provided with a listening that of-Fig. 1, to enable the to cut in on the line and talk to the subkey similar to B-line operator scribers.

For tlie signaling devices D, D and M, I may use anHelectric si nal lamp in. series a relay controlling a suitable electrically-oper- For the battery E, I may use In this: invention I do not wish to be to the parutilized without departing from l Vhat I claim as my invention is:

l. A telephone line extending from a source of electricity to a station and having a signaling device in series therewith, means for connecting the signaling device in a bridge of the' line between the said source and station, and means for causing the signaling device to display a signal in each said 2. A telephone line extending from a l source of electricity to a station and having v signal. The subscriber A gives his disconf nect signal as hereinbefore set forth, whereupon the A-line operator withdraws the.

a signaling device in series therewith, means whereby connection with the line connects the signaling device in a bridge of the line between the said source and station, and

&

station to a central station, a signaling device and source of electricity at the central station in a series circuit with the line,

means at the substation for closing the said circuit to cause the signaling device to display a signal, and means at the central station whereby connection with the line changes the circuit of the signaling device from a series circuit of the line to bric ging circuit of the line between the said source and the substation, the said means at the substation now controlling the circuit of the line as a shunt to the signaling device to control the operation of same.

l. A telephone line extending from a sub station to a central station, a signaling device and source of electricity at the central station, means at the central station for connecting the signaling device in series with the line and in a bridge across the line between the said source and the substation, and means atthe substation for controlling thesaid series circuit and for controlling the circuit of the line as a shunt to the said bridge, for operating the signaling device in each said connectlon.

5. A telephone line extending to a central station, a signaling device and source of electricity at the central station, means for connecting the signaling device in a series circuit with the line and in multiple with the line and the said source, and means for operating the signaling device in each said connection.

6. A telephone line extending from a substation to a central station, a signaling device and source of electricity atthe'centrav station, means at the central station for con necting the signaling device in series with the line and in multiple with the line and the said source as desired, and means at the substation for opening and closing the circuit of the line as the said series circuit or as a portion of the said multiple circuit, to operate the signaling device as desired.

'7. A telephone line extending to a central. station, a signaling device and source of electricity at the central station, means for connecting the signaling device and source in series with the line and the signaling device in multiple with the line and the said source as desired, and means for operating the signaling device in each said connection.

8. A telephone line, a signaling device and source of electricity in series therewith, connecting means for the line, means wherebyconnection with the line connects the signaling device in a bridge across the line eX tending to the said source, and. means for causing the signaling device todisplay a signal in each said connection.

9. An electrical transmitting line, an elec trically-operable device and electrical sup ply associated therewith, means for connecting the said'device in series with the line and in multiple with the line and electrical supply as desired, and means for operating thesaid device in each said connection.

10. An electrical transmitting line, an

electrically-operable signaling device 0011- nected in series therewith, electrical supply, means for connecting the said device in a bridge across the line extending to the electrical supply, and means for operating the said device in each arrangement.

- 11. An electrical transmitting line, an electrically-operable signaling device and source of electricity normally connected in series with the line, means for connecting the said device in a bridge across the line extending to the saidsource, and means for operating the said device in each connection.

lQr'An electrical transmitting line extending from a substation to a central station, an electrically-operable device and source of electricity at the central station in series with the line, connecting means for the line, means whereby connection with the line connects the said device in multiple with the line and the said source, and means at the substation for controlling the circuit or" the line to operate the said device or render same inoperative, in each connection.

13. An electrical transmitting line extending to a central station, connecting 'ineansfor the line, an electrically-operable device connected to be operated by current in the line, electrical supply, and means whereby connection w1th the line at the central station connects the sand device in a shunt circuit with the line extending to the electrical supply.

M. An electrical transmitting line, connecting means for the line, an electricallyoperable device connected to be operated by current in the line, electrical supply, and means whereby connection with the line con- ,nects the said line as a shunt around the said device relatively to the electrical supply.

15. A telephone talking circuit extending fromacentral station to a substation, a signaling device at the central station, and a jack adapted for connecting the signaling levice in'series with a portion of both limbs of the talking circuit extending to the substation, and in series with a portion of both limbs, .01 the talking circuit at the central station only, for signaling purposes.

16. A telephone talking circuit extending from'a central station to a substation, a

signaling device at the central station, and

means for operating the signaling device in series with a portion of both limbs of the talking circuit extending to the substation to give line signal, and for operating the signaling device in series with another por the central station only to give asupervisory tion of both limbs of the talkingzcircuit at tion of the said main conductor and return atthe central station only, and means for operating the signalingmeans in connection to give another signal,

18. An electrical transmitting circuit having suitable electrical supply,signal-initiating means therefor, and meansfor connecting the signal-initiating means in series with the said circuit to provide a signal, and for connecting the signal-initiating means across the said circuit extending to the electrical supply to provide another signal.

19. A metallic telephone line extending from a substation to 'a'central station, a signalin device and source of electri'cit at-the' b central station normally in series with the line, connecting means for the line, means whereby connection with the line changes the connect-ion oi the said source with the line and connects the signaling device across the metallic line, and means at the substation for controlling the said series circuit to operate the signaling device asa line signal and forcontrolling the circuit of the line as a shunt to the signaling device to operate the latter as a supervisory signal.

20. A. telephone line extending from a substation to a central station, a signal-initiating device and source of electricity inseries with the line at the-central station when no connection is made with the line, a connecting circuit for the line, and suitable connections whereby the signal-initiating device is operated over a circuit at the central sta tion only, including a talking strand of the connecting circuit, when connection is made with the line whilethe apparatus at thesubstation is not in use.

21. The combination with a telephone talking circuit, of a signaling-device in series therewith, electrical supply, and means.

whereby the signalingdevice maybe connected acrossthe said circuit extendingto the electrical supply for signaling purposes.

22. A. series circuit comprising an, electrical transmitting line, a signal-initiating device, and a source of electricity, and means whereby the said source may be cut out of the said series circuit and the latter closed through only the said deviceand line.

28. A series circuit comprising a telephone line, a signaling devica and a source ofelecthe latter the line.

may be cutout of the saidseries circuit and connected in multiple with the signaling deviceon the line.

24:. A metallic electrical transmitting line extending from a substation to a central staitio'n, an electrically-operable device associ ated with the line, suitable electrical sup- :P- y, the substation and the central station cooperating to operate the said device in series and.manually-operable means at both with the metallic line and in a bridge across the lineextending to the electrical supply.

An electrical transmitting line extending from a substation to a central station, an electrically-operable device associated with the line, suitable electrical supply for the said device, andaswitch at both the substation and the central station cooperating to Operate the said device in a series circuit with-the line and'ina bridging circuit of the line, the circuit arrangement being such that each switch may operate the saiddevice and rendersame inoperative independently of {the position ot the other switch.

26., In an electrical transmitting system, lines extending to a central station, an elec trically-operable device for each line at the kcentral'station, electrical supply at the Cen- Etral station, andmeans at the central station :whereby' each said device may be connected in 'aseries circuit with its line and in a bridge across the line extending to the electrical supply, forsignaling purposes.

27. In an electrical transmitting lines extending to a central station,

system, an electrically-operable device for each line at the ,Icentral station, a common source of electricjity for operating the said devices, and means at the central station whereby each said device may be connected in a series circuit with its lineand the said source, and in abridge across the line extending to the said source, .for purposes substantially as set ;fortli..

[28. An electrical transmitting line extend :ing to acentral station, an electrically-operable device associated therewith, electrical supply, and means at the central station 'adapted to, connect the said device in series "ith the line and in multiple with the line and the electrical supply, as desired. I .29. In combination, a metallic telephone line extending to a central station, a signal- ,in'gjtdevice, a source of electricity, a metallic connecting circuit for the line, means for establishing a circuit through the said source, the metallic'line, and the said device, to opcrate the latter when no connection is made with theline, and means for establishing a circuit through the said source, the metallic connecting circuit, and the said device, exelusive of the exterior line, to operate the said device whenconnection is made with tricity, and means whereby the said' source normally 80. A telephone line extending from a substation to a central station where it terminates in suitable connection terminals, a plug-cord circuit adapted to be connected with the line, a signaling device and source of electricity in series with the line, means at the substation for closing the said series circuit to cause the signaling device to give a line signal, and means whereby connection with the line bridges the signaling device across the line to be shunted by same and thereby rendered inoperative.

31. A telephone line extending from a substation to a central station where it ter-v minates in suitable connection terminals, a plug-cord connecting circuit for the line, a signaling device and source of electricity in series with the line, means whereby connection with the line bridges the signaling device across the line to cause it to display a signal. when the apparatus at the substation is not in use, and means at the substation for closing the circuit of the line as a shunt around the signaling de vice to render same inoperative.

A telephone line extending from a substation to a central station, a connecting circuit for the line at the central station, a signaling device and source of electricity at the central station normally in series with the line, a switch at the substation forclosing the said series circuit to operate the signaling device as a line signal, meansv whereby connection with the line places the latter in multiple with the signaling device to shunt same and render it inoperative, opening'the line circuit at the substation now taking the shunt away from the sig naling device and causing same to operate as a supervisory signal.

33. A telephone line extending from a substation to a central station, a connecting circuit for the line, a signaling device associated with the line, a source of electricity at the central station associated with the line and connecting circuit, means at the substation for closing the circuitof the said source through the signaling device and line when no connection is made with the line, to produce a linesignal, and means whereby connection with the line places the signaling device in multiple with the line and closes the circuit of the said source through the connecting circuit and the signaling device to produce a supervisory signal while the apparatus at the substation is not in use.

34. The combination of two telephone lines extending to a central station, a connecting circuit for the lines, terminating in two connecting plugs,1a signallng device for each line, and means for operating each sig naling device in series with its line and in series with the main strands of a connecting plug to be shunted by the line and renderedinoperative.

35. A. plurality of telephone lines, a signaling device for each line normally in series therewith, means for bridging each signaling device across its line when connection is made with the respective lines, whereby the latter may shunt the signaling devices, andmeans whereby each subscriber takes his line shunt away from the signaling deviceof his line when he is through with the line and thereby causes the signaling device to give a disconnect signal.

36. The combination with a telephone line extending to a central station, of a signalinitiating device at the central station, a connecting circuit at the central station, and a jack for connecting the signal-initiating device in a loop with the line, and in a loop with the connecting circuit exclusive of the I device in series with the line and electrical supply, means for connecting the said device in multiple with the line and electrical supply, and means for operating the said device in each of the said connections.

39. .41 telephone talking circuit, a signaling device, a jack and plug connection adapted for connecting the signaling device in series with entirely difierent portions of both limbs of the talking circuit at different times, and means for operating the said device in each of the said connections.

40. An electrical transmitting line, an electrically-operable device, suitable electrical supply, means for connecting the said device in series with the line, means for connecting the said device in multiple with the electrical supply on the line, and means for operating the said device in each of the said connections. i

As inventor of the foregoing I hereunto subscribe my name this 11th day of July,

FRAN one K. PARKER, EDNA MILLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of ZPatents, Washington, D. 0. 

